Kylie Jenner announced on Instagram she was injured while bouncing on a trampoline with her sisters and fellow U.S reality TV stars Khloe and Kim Kardashian.

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"In the hospital thanks to @khloekardashian," Jenner, 16, said in a message posted Tuesday. "My mom said, 'Never thought I would take u to the doctor for a trampoline accident at this age.' This means war Khloe."

"This started out calm and ended in a war! Sorry @kyliejenner," Khloe Kardashian, 29, wrote back.